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Author SHA1 Message Date
hpayer@chromium.org
7ff046c3fd Implemented function that returns code age. 
This may be used to display debugging information.

BUG=
R=danno@chromium.org, mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/16509005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15083 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 12:39:15 +00:00
wingo@igalia.com
1fb2f4b358 For-of statements do not permit initializers. 
R=rossberg@chromium.org
BUG=v8:2720

Review URL: https://codereview.chromium.org/16739008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15082 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 12:37:44 +00:00
wingo@igalia.com
8f15c921ee Re-enable the harmony => harmony-generators implication after r15079. 
R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16815002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15081 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 11:48:55 +00:00
verwaest@chromium.org
af2c736cb8 Print v8 revision rather than branches/$branch. 
R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/16814003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15080 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 11:18:45 +00:00
wingo@igalia.com
418ddc800a Allocate generator result objects before unwinding try handlers 
When a generator suspends, it saves its state out to the heap and
unwinds try handlers but doesn't pop anything off the stack.  Instead it
relies on no GC happening between the suspend and the return from the
generator.  However this was not the case: boxing the result object
could cause GC, which would try to traverse the stack but would
misinterpret words from unwound try handlers as heap objects.

This CL changes to allocate the result objects before the suspend.  It
also removes the generators-iteration skip introduced in r15065.

R=mstarzinger@chromium.org
TEST=mjsunit/harmony/generators-iteration
BUG=

Review URL: https://codereview.chromium.org/16801006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15079 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 11:02:51 +00:00
verwaest@chromium.org
dac82c5650 Adding useful scripts to parse revision info. 
R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/16812003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15078 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 10:39:52 +00:00
yangguo@chromium.org
74556569d1 Reland "Enable map dependency to in-flight compilation info." 
BUG=248076
R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/16782004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15077 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 09:43:22 +00:00
dslomov@chromium.org
ecaf460548 Unify processing of weak lists in heap.cc 
R=hpayer@chromium.org, mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/16641003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15076 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 09:31:39 +00:00
dcarney@chromium.org
b34d1cf3e6 release callback table memory in ~Isolate 
R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16304008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15075 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 08:57:36 +00:00
loislo@chromium.org
29abaf4aad DevTools: CPUProfiler: provide url for scripts that have sourceURL property. 
BUG=none
TEST=SourceURLSupportForNewFunctions, LogExistingFunctionSourceURLCheck
R=jkummerow@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/16035027

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15074 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 08:27:24 +00:00
ulan@chromium.org
1e4448b581 Use -O2 instead -O3 for Android build. 
It produces smaller binary with almost the same performance.

R=benm@chromium.org, jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/15929009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15071 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-12 08:05:43 +00:00
plind44@gmail.com
0edbf9e709 MIPS: Skip some conditional deopts for Div/Mul when all uses are truncating. 
Port r15060 (8cdd204)

Original commit message:
- set "can be minus zero" flag properly so minus-zero checks are skipped
- skip "integer result?" check in division code when uses are truncating
- drive-by cleanup: consolidated computation of kCanOverflow flag for Add/Sub into range inference phase

BUG=v8:2132
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/16645007

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15070 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 17:41:03 +00:00
ulan@chromium.org
c2dab39b71 Prepare push to trunk. Now working on version 3.19.14. 
R=jkummerow@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/16276010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15067 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 15:37:56 +00:00
yurys@chromium.org
eb037a86fd Test that functions created using v8::FunctionTemplate::New correctly displayed in CPU profiles 
BUG=244580
R=jkummerow@chromium.org, loislo@chromium.org

Review URL: https://codereview.chromium.org/16771002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15066 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 15:00:41 +00:00
wingo@igalia.com
5760c7b598 Disable --harmony -> --harmony-generators implication 
A GC-related bug has started showing up after r15060 that unfortunately
I haven't been able to reproduce.  Disable generators by default for the
Canary push.

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16638011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15065 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 14:45:17 +00:00
mstarzinger@chromium.org
b348744c56 Add tracing for functions processed by code flushing. 
R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/16773002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15064 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 14:40:44 +00:00
plind44@gmail.com
7dc6f57fe8 MIPS: Allow timeout for TerminateMultipleV8ThreadsDefaultIsolate. 
test-thread-termination/TerminateMultipleV8ThreadsDefaultIsolate
times out on the MIPS simulator.

Allow the timeouts until this is fixed.

BUG=v8:2657
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/16203005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15063 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 14:31:46 +00:00
plind44@gmail.com
8f66deead7 MIPS: Fix memory barriers for atomic operations. 
Add barriers using MIPS 'sync' instructions as needed for SMP
systems.

BUG=246947
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/15981017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15062 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 14:30:43 +00:00
yangguo@chromium.org
6da97b1d4a Revert "Enable map dependency to in-flight compilation info." 
This includes r15032, r15030 and r15005.

R=ulan@chromium.org
BUG=248076

Review URL: https://chromiumcodereview.appspot.com/16482004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15061 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 11:55:56 +00:00
jkummerow@chromium.org
9447014780 Skip some conditional deopts for Div/Mul when all uses are truncating. 
- set "can be minus zero" flag properly so minus-zero checks are skipped
- skip "integer result?" check in division code when uses are truncating
- drive-by cleanup: consolidated computation of kCanOverflow flag for Add/Sub into range inference phase

BUG=v8:2132
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/16741002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15060 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 11:43:57 +00:00
wingo@igalia.com
f68d6a10f8 Fix crasher when checking for "of", but next token has no literal buffer 
Also fix a typo in an assertion in scanner.h.

R=mstarzinger@chromium.org
BUG=248025
TEST=mjsunit/regress/regress-crbug-248025.js

Review URL: https://codereview.chromium.org/16549003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15059 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 11:30:03 +00:00
dcarney@chromium.org
dbeafbaaff interceptor return values escape their scope 
R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16537005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15058 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 11:08:46 +00:00
jkummerow@chromium.org
57632e208a Increase sanity of integer division handling on ARM 
- In the INT32 BinaryOpStub, fix type feedback collection for DIV,
  bringing it in line with other platforms.
- In Lithium codegen, emit proper inlined code, don't call the stub.
- Drive-by fix: assert appropriate CpuFeaturesScope for SDIV.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/16082008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15057 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 10:47:44 +00:00
dslomov@chromium.org
9278a4b7b1 Change ArrayBuffer API and implementation to use embedder-provided allocator. 
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/15855012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15056 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 10:41:14 +00:00
yurys@chromium.org
b90bd6987b Make sure CallIC is in monomorphic state when starting profiling in NativeAccessorNameInProfile2 
Changed cctest/test-cpu-profiler/NativeAccessorNameInProfile2 to make a few warm-up cycles before starting profiler so that accessor invocations performed via monomorphic inline caches and slow paths traces do not distort the profile.

Drive-by: removed logging code that was used to diagnose NativeAccessorNameInProfile2 failures on Windows.

BUG=None
R=jkummerow@chromium.org, loislo@chromium.org

Review URL: https://codereview.chromium.org/16758007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15055 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 08:32:48 +00:00
dcarney@chromium.org
c90e697a30 make empty string returnable by ReturnValue 
R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16621004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15054 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-11 07:42:12 +00:00
palfia@homejinni.com
1d4c64591b MIPS: Fix abs_d instruction in the simulator. 
The abs_d instruction was implemented wrongly in the simulator,
it doesn't reverse the sign of the -0 number.

This commit fixes the abs_d instruction implementation.

TEST=msjunit/math-abs

BUG=

Review URL: https://codereview.chromium.org/15906014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15053 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 21:54:07 +00:00
palfia@homejinni.com
88021e64b1 MIPS: Use compare nil ic only for non-strict equality. 
Port r15045 (cce366f)

Original commit message:
Strict-equality only has one check and cannot deopt. Should therefore not be part of the stub.

BUG=

Review URL: https://codereview.chromium.org/16690008
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15050 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 18:16:27 +00:00
palfia@homejinni.com
eb7e2771a9 MIPS: Generator object "next" method takes optional send value. 
Port r15028 (258a047)

Original commit message:
Update the generators implementation to make "next" also do the job of
what was previously called "send" by taking an optional argument.
Remove send, and do a bunch of renamings.

BUG=v8:2355, v8:2715

Review URL: https://codereview.chromium.org/16735005
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15049 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 18:14:15 +00:00
palfia@homejinni.com
2ebb95071a MIPS: Fix LoadIC calling convention. 
Port r15027 (3ffb343)

Original commit message:
The comments in ic-arm.cc::LoadIC indicated that the receiver should be
both in a register and on the stack. This isn't true in fact: the code
is careful to spill the receiver if needed.

This CL also fixes up a mistaken use of this convention in VisitYield.

BUG=

Review URL: https://codereview.chromium.org/16131004
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15048 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 18:10:58 +00:00
palfia@homejinni.com
b7e06629f3 MIPS: add a default value for return value 
Port r15024 (1a76177)

BUG=

Review URL: https://codereview.chromium.org/16005015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15047 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 18:07:28 +00:00
yangguo@chromium.org
5cf0cba71a Fix compilation with gdbjit=on. 
r14919 forgot three AssertNoAllocation -> DisallowHeapAllocation replacements.

BUG=v8:2719
R=yangguo@chromium.org

Review URL: https://chromiumcodereview.appspot.com/16093041

Patch from Kang-Hao (Kenny) Lu <kennyluck@csail.mit.edu>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15046 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 16:31:55 +00:00
olivf@chromium.org
946ea53264 use compare nil ic only for non-strict equality. strict-equality only has one check and cannot deopt. should therefore not be part of the stub. 
BUG=
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/16732002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15045 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 15:47:23 +00:00
olivf@chromium.org
3a26dda780 revert accidental dcommit 
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15044 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 15:43:40 +00:00
olivf@chromium.org
23691cf023 also remove the constant 
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15043 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 15:30:17 +00:00
olivf@chromium.org
73b7ab9ae6 remove equality kind from compare nil ic 
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15042 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 15:30:02 +00:00
verwaest@chromium.org
b51c0295cc Prepare push to trunk. Now working on version 3.19.13. 
R=jkummerow@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/16730004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15039 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 15:10:44 +00:00
mvstanton@chromium.org
4d7e939ed6 Array access fix: g++ darwin 4.2.1 compiler clamped array index to 0 when confronted with negative indices. 
BUG=247303
R=jkummerow@chromium.org, ulan@chromium.org

Review URL: https://codereview.chromium.org/15855015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15038 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 14:44:05 +00:00
hpayer@chromium.org
09495dfea2 Fix store buffer ensure space heuristics. 
This change results in less scan on scavenge memory chunks.

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/15896037

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15037 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 14:22:41 +00:00
wingo@igalia.com
29a1044409 Keep native fuzzing blacklists in sync 
R=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16436005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15036 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 12:25:31 +00:00
wingo@igalia.com
093492f01c Don't fuzz _GeneratorNext 
The previous patch that renamed _GeneratorSend to _GeneratorNext missed
the blacklist in fuzz-natives-part4.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16339008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15035 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 12:06:13 +00:00
svenpanne@chromium.org
66bb4c5b8d Improve code for integral modulus calculation. 
Depending on what we know about the right operand, we basically do 3
different things (and the code is actually structured this way):

* If we statically know that the right operand is a power of 2, we do
  some bit fiddling instead of doing a "real" modulus calculation.
  This should actually be done on the Hydrogen level, not on the
  Lithium level, but this will be a separate CL.

* If type feedback tells us that the right operand is a power of 2, we
  do the same as above, but guarded by conditional deoptimization to
  make sure that the assumption is still valid. In the long run, we
  should make this guard visible on the Hydrogen level to make it
  visible for GVN and other optimizations.

* In the general case we only do the minimum steps necessary and don't
  try to be too clever, because cleverness actually slows us down on
  real-world code.

If we look at the code gerators for LModI, we actually see that we
basically have 3 (4 on ARM) fundamentally different translations. I
don't really like lumping them together, they should probably be
different Lithium instructions. For the time being, I restructured the
generators to make this crystal-clear, at the cost of some duplication
regarding the power-of-2 cases. This will go away when we do the
strength reduction on the Hydrogen level, so I'd like to keep it as it
is for now.

Note that the MIPS part was only slightly restructured, there is still
some work to do there.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/15769010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15034 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 12:05:54 +00:00
mstarzinger@chromium.org
ecc41e30c0 Fix re-initialization of existing double field. 
R=verwaest@chromium.org
BUG=v8:2717
TEST=mjsunit/regress/regress-2717

Review URL: https://codereview.chromium.org/16735003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15033 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 11:55:47 +00:00
yangguo@chromium.org
b0afb77731 Fix parallel recompilation wrt transition maps dependency. 
R=ulan@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/15896038

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15032 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 11:33:23 +00:00
verwaest@chromium.org
dbb16eaec3 Lookup transition again after migrating a transition target. 
R=ulan@chromium.org
BUG=chromium:242332

Review URL: https://chromiumcodereview.appspot.com/16347005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15031 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 11:27:09 +00:00
yangguo@chromium.org
1594eca8ed Fix parallel recompilation wrt initial object/array map dependency. 
R=ulan@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/16641002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15030 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 11:17:48 +00:00
dcarney@chromium.org
b12e6a9c1e adjust assertions for addition of default value 
R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16136012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15029 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 09:35:47 +00:00
wingo@igalia.com
f88bca9576 Generator object "next" method takes optional send value 
Update the generators implementation to make "next" also do the job of
what was previously called "send" by taking an optional argument.
Remove send, and do a bunch of renamings.

R=rossberg@chromium.org
BUG=v8:2355, v8:2715

Review URL: https://codereview.chromium.org/16136011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15028 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 09:26:18 +00:00
wingo@igalia.com
601e1cf0d5 Fix LoadIC calling convention on ARM 
The comments in ic-arm.cc::LoadIC indicated that the receiver should be
both in a register and on the stack.  This isn't true in fact: the code
is careful to spill the receiver if needed.

This CL also fixes up a mistaken use of this convention in in
VisitYield.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16203004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15027 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 09:12:57 +00:00
dcarney@chromium.org
e13aac5fcc build fix for 15025 
R=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16561011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15026 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-06-10 08:19:03 +00:00